Internal-combustion engine cooling for rotary valves



K. HAASE Nov. 11, 1952 INTERNAL-COMBUSTION ENGINE COOLING FOR ROTARY VALVES 2 Sl-IEETS-SI-iEET l Filed June 23, 1950 Fig. 2

Inventor:

/rum- HAAsE f m ATTORNF YS Nov, 11, 1952 21511395 INTERNAL-COMBUSTION ENGINE COOLING FOR ROTARY VALVES Filed June 25, 1950 K. HAAsx-z 2 SHEETS--SHEET 2 Al f lm/emfon' KUR 7' HA A SE ATTORNE YS Patented Nov. 1.1, 1952 OFFICE lNTERNAL-COMBUSTION ENGINE COLBNG FOB, ROTARY VALVES Kurt Haase, Mielkendorf, Germany, assignor to Sdwerke G. m. b. H., Kulmbach, Germany Application June 23, 1950, Serial No. 169,811 In Germany .l une 29, 1949 7 Claims The present invention relates to internal combustion engines and, in particular, to air cooled internal combustion engines with air cooled rotary slide valve control.

As is well known, with slide valve controls, in contrast to poppet valve controls, a moving and a stationary part have tightly to seal with regard to each other under highly difficult thermo and mechanical conditions. With a poppet valve both parts are stationary during the closing or sealing period. With a rotary slide valve, the sealing shoe is the member which is subjected to the greatest thermo and mechanical stress.

It is, therefore, an object of this invention to construct the sealing shoe of rotary slide valve controlled internal combustion engines in such a manner and to cool such shoes so as to maintain the temperature of the sealing shoe below a predetermined limit in order to avoid distortion of the shoe which would make a proper sealing between the shoe and its cooperating parts impossible.

It is another object of this invention to provide an effective air cooling arrangement for the sealing shoe which will maintain a substantial balance between the heat developed at said shoe and the heat radiated therefrom.

These and other objects and advantages of the invention will appear more clearly from the following speciiication in connection with the accompanying drawings in which:

Figure 1 illustrates a transverse section through the upper part of an internal combustion engine, provided with a rotary slide valve, and the cooling arrangement according to the present invention for said valve.

Figure 2 is a section along the line II--II of Figure 1, while Figures 3 and 4 represent sections along the lines III- III and IV-IV respectively of Figure 1.

Referring now to the drawings in detail, the structure shown therein comprises a cylinder casing I having mounted thereon the cylinder head which comprises a lower part 2 and an upper part 3. Interposed between the two parts 2 and 3 within the area of each cylinder 5 is a sealing shoe 6. I'he sealing shoe 6 and the upper part 3 form the bearing proper for the drum-shaped rotary slide valve d. The rotary valve 4 is sealed relative to the surrounding elements by means of the sealing shoe 5. This shoe, which is to be inserted into the structure from the top, has arranged transverse to the axis of rotation of the slide valve Il and on each side thereof, a cylinder-shaped stud l (see Figures 1 and 3). This (Cl. 12S-41.69)

stud engages correspondingly shaped recesses 8 provided in the lower part 2 and the upper part 3 respectively.

The sealing shoe 5 and the parts 2 and 3 are sealed by means of piston rings 9 mounted in grooves I0 0f the stud The lower part 2 has an extension II which engages the upper part of the cylinder 5. Arranged immediately above this extension of part 2, there is provided a circular recess I2 which guides an extension I4 of the sealing shoe Il. Piston rings I3 are mounted in correspondingly shaped grooves in the extension Id in order to provide a proper seal between the extension I4 and the recess I2. Laterally with regard to the recess I4, there are provided compression springs I5 which continuously press the sealing shoe 6 against the rotary slide valve d.

The cylinder 5 is provided with vertically extending cooling ns I6, preferably of the shape shown in Figure 1. Corresponding cooling ns I'I, I8 and I9 are provided at the lower part 2, the sealing shoe 6, and the cylindrical studs 'I as well as the upper part 3, as clearly shown in Figures 1 and 2. As will be visible from Figure 2, the cooling ns I6, I'I, I8 and I9 are so arranged that, when seen from above, they will be in alignment with each other. Consequently, the air passing by the cylinder 5 and moving upwardly will sweep over and bathe the above-mentioned cooling iins one after another and will thus cool the same while the cooling process is effected within the box-shaped cylinder head 2, 3.

It is, of course, understood that the present invention is by no means limited to the particular structure shown in the drawings but, also, comprises any modications within the scope of the appended claims.

What I claim is:

l. In combination in a cylinder head with slide valve control, a lower supporting member, an upper supporting member, a rotary slide valve, an intermediate member interposed between said upper and said lower supporting members and arranged in cooperation with said upper supporting member rotatably to support said slide valve, cylindrical extensions associated with said intermediate member and extending in a direction transverse to the axis of rotation of said slide valve, said extensions engaging correspondingly shaped recesses provided in said upper supporting member and said lower supporting member respectively, and sealing means interposed between said intermediate member on one hand and said upper and lower supporting members on the other hand.

2. In combination, in a cylinder head with slide valve control, a lower supporting member mounted on the cylinder head, an upper supporting member engaging said lower supporting member and coniining therewith cylindrical spaces extending in a direction transverse to the axis of rotation of the slide valve and also transverse to the axis of the cylinder of the engine, an intermediate member between said upper and lower supporting members adapted to be inserted into the said lower supporting member from above and provided with cylindrical extensions extending into said cylindrical spaces, and a rotatable slide valve rotatably supported by said intermediate member and said upper member, said extensions having heat exchange surfaces at their outer portions.

3. In combination in a cylinder head with slide valve control, a first supporting member, a second supporting member engaging said rst supporting member and confining with the latter cylindrical spaces, a third supporting member interposed between said rst and said second supporting members and provided with cylindrical extensions engaging said cylindrical spaces, a rotary slide valve rotatably supported by said second and third supporting members, and piston rings mounted in said cylindrical extensions and engaging adjacent surfaces of said rst and second members to effect a sealing between said cylindrical extensions and said iirst and second supporting members.

4. In combination in a cylinder head with slide valve control, a first supporting member, a second supporting member engaging said first supporting member and confining with the latter cylindrical spaces, a third supporting member interposed between said first and said second supporting members and provided with two cylindrical extensions engaging said cylindrical spaces, said third supporting member being provided with a third extension having its longitudinal axis at an angle to the longitudinal axes of said rst mentioned two cylindrical extensions, said third extension engaging a, corresponding guiding surface in said iirst supporting member, first piston ring means interposed between said rst two extensions and the adjacent surfaces of said first and said second supporting members, and further piston ring means interposed between said third extension and the adjacent area of said rst supporting member.

5. In combination with a cylinder head with slide valve control, a lower supporting member, an upper supporting member, a rotary slide valve, and an intermediate member interposed between said upper and said lower supporting members and arranged in cooperation with said upper supporting member rotatably to support said slide valve, said upper and lower members confining recesses aligned on an axis transverse to and intersecting the axis of the said valve, said intermediate member being provided with lateral extensions extending loosely into the said recesses formed by said lower and upper supporting members, and sealing means about the periphery of said extension in said recesses, said intermediate member and its lateral extensions being provided laterally outwardly with cooling ns.

6. In a cylinder head with slide valve control for use in connection with internal combustion engines, a lirst supporting member, a second supporting member engaging said first supporting member and conning therewith cylindrical spaces, a third supporting member having cylindrical extensions engaging said cylindrical spaces, a rotary slide Valve rotatably journalled in said second and third supporting members, and cooling fins respectively associated with said first, second and third supporting members and arranged so as to cause the air leaving the cooling ns of the cylinder of said internal combustion engine successively to sweep the cooling ns of said rst, third and second supporting members.

7. An arrangement according to claim 6, characterized in that at least a portion of said cooling fins of said first, second and third supporting members are in alignment with the cooling ns of the cylinder of the internal combustion engine.

KURT HAASE.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,131,776 Ewart Mar. 16, 1915 1,181,974 Blye May 2, 1916 1,278,083 Force Sept. 3, 1918 1,777,464 Edwards 'Oct .7, 1930 2,217,853 Baer Oct. 15, 1940 OTHER REFERENCES Ser. No. 371,803, Heylant et al. (A. P. C.), published May l1, 1943. 

